The Fotodiox Universal Gobo Image Projection Attachment allows you to project unfocused or sharply focused gobo slide patterns or an optical spot of various size using the built-in iris, ideal for precise and selective lighting of a subject. Balcar & Compatible Lights - Popular models include: Balcar Flashpoint I Paul C. Buff Strobes (Alien Bees, Einstein v2. 0, White Lightning) Fotodiox Pro LED-100WB Studio LEDs Please Note: Works best on monolights that are focusable, such as the Popspot Ultra style of lights. All pictures are for illustration purposes only. Actual product may vary slightly due to ongoing improvements in design.